Solution Found!
Repeat Prob. 2–85 for umax = 7 m/s.
Chapter 2, Problem 80P(choose chapter or problem)
Problem 80P
Repeat Prob. 2–85 for umax = 7 m/s.
Questions & Answers
QUESTION:
Problem 80P
Repeat Prob. 2–85 for umax = 7 m/s.
ANSWER:
Solution 80P
Following the same method as in Prob. 2–85 for = 7 m/s.
In regions far from the entrance, fluid flow through a circular pipe is one-dimensional, and the velocity profile for laminar flow is given by u(r) =( 1 –/), where R is the radius of the pipe,r is the radial distance from the center of the pipe, and is the maximum flow velocity, which occurs at the center.
a.)
Step 1 of 1
A relation for the drag force applied by the fluid on a section of the pipe of length L is given by
= where,= shear stress ,= area on which shear stress is acting =
can be now determined by first finding the shear stress .
The shear stress at the pipe surface can be expressed as
]
= ()
=
=